US20210319086A1 - Biometric authentication device - Google Patents
Biometric authentication device Download PDFInfo
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- US20210319086A1 US20210319086A1 US17/271,937 US201917271937A US2021319086A1 US 20210319086 A1 US20210319086 A1 US 20210319086A1 US 201917271937 A US201917271937 A US 201917271937A US 2021319086 A1 US2021319086 A1 US 2021319086A1
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- biometric authentication
- biometric
- captured image
- biometric information
- determination unit
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/31—User authentication
- G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
- A61B5/6893—Cars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/20—Means to switch the anti-theft system on or off
- B60R25/25—Means to switch the anti-theft system on or off using biometry
- B60R25/252—Fingerprint recognition
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- G06K9/0002—
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- G06K9/001—
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- G06K9/00919—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
- G06V40/1376—Matching features related to ridge properties or fingerprint texture
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/60—Static or dynamic means for assisting the user to position a body part for biometric acquisition
- G06V40/63—Static or dynamic means for assisting the user to position a body part for biometric acquisition by static guides
Definitions
- FIG. 2A is a block diagram illustrating the start switch device in the embodiment.
- this biometric authentication device When the captured image is not suitable for biometric authentication, this biometric authentication device notifies of it before performing biometric authentication,
- the biometric information device is not limited to the start switch device I and can be mounted on a device that performs biometric authentication for login, unlock or payment.
- the start switch device I has, e.g., a control unit 5 as a determination unit that does not perform biometric authentication when determining that a captured image 22 captured by a biometric information sensor 2 provided to read biometric information 23 of a user is unsuitable for biometric authentication, but instead outputs a notification signal S 4 to cause a notification unit to issue a notification indicating that the captured image 22 is unsuitable for the biometric authentication, as shown in FIGS. 1B and 2A .
- a control unit 5 as a determination unit that does not perform biometric authentication when determining that a captured image 22 captured by a biometric information sensor 2 provided to read biometric information 23 of a user is unsuitable for biometric authentication, but instead outputs a notification signal S 4 to cause a notification unit to issue a notification indicating that the captured image 22 is unsuitable for the biometric authentication, as shown in FIGS. 1B and 2A .
- the control unit 5 is configured to determine that the captured image 22 is unsuitable for the biometric authentication when the number of characteristic features 6 (described later) extracted from the captured image 22 is not more than a notification threshold value 52 as the first notification threshold value.
- the biometric information sensor 2 outputs, e.g., capacitance information S 1 , which is generated based on plural capacitances read by scanning, to the control unit 5 .
- the capacitance information S 1 is generated based on, e.g., capacitances in one cycle.
- the control unit 5 When, the number of the characteristic features 6 is not more than the notification threshold value 52 , the control unit 5 outputs the notification signal S 4 to the vehicle control unit 89 . Based on the input notification signal S 4 , the vehicle control unit 89 causes, e.g., a message image 861 , which indicates that the captured image 22 is unsuitable for the biometric authentication, to be displayed on a display screen 860 of the main monitor 86 , as shown in FIG. 3B .
- a message image 861 which indicates that the captured image 22 is unsuitable for the biometric authentication
- control unit 5 may be configured to determine whether or not the captured image 22 is suitable for biometric authentication based on a combination of at least two of the condition related to the number of the characteristic features 6 , the condition related to the difference between the binary values, and the condition related. to the area which are described above.
- the control unit 5 acquires the captured image 22 that is captured when the user touched the operation button 12 of the start switch device 1 (Step 1 ),
- the start switch device 1 can make the main monitor 86 , etc., to display the message image 861 indicating that the captured image 22 is unsuitable for the biometric authentication, thereby notifying the user of the deposition of a foreign matter. etc. Therefore, as compared to when not issuing a notification, the user can easily take measures such as wiping the reading surface 20 of the biometric information sensor 2 or wiping the finger, and thus can be successfully biometrically authenticated at an early stage.
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- Animal Behavior & Ethology (AREA)
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Abstract
Description
- The present patent application claims the priority of Japanese patent application No. 2018/165270 filed on Sep. 4, 2018, and the entire contents of Japanese patent application No. 2018/165270 are hereby incorporated by reference.
- The present invention relates to a biometric authentication device.
- A start control device is known which is provided with a start switch giving an instruction to start or stop a drive source, a start-up means for starting the drive source, a fingerprint sensor for reading fingerprints, and a control means which, based on inputs from the fingerprint sensor and the start switch, implements a start-up process to control activation of the start-up means (see, e.g., Patent Literature 1),
- When the start switch gives an instruction to start, the control means of the start control device performs fingerprint verification by comparing a fingerprint read by the fingerprint sensor with a pre-registered fingerprint before start-up by the start-up means, and once a. match is found, the control means authenticates the user as a genuine user and allows the start-up means to start up.
- Patent Literature: JP 2008/174095 A
- In case of the start control device disclosed in
Patent Literature 1, when, e.g., a read fingerprint is not suitable for biometric authentication because of a foreign matter such as liquid sticking to a finger or the fingerprint sensor and biometric authentication is unsuccessful, the user does not know why it was unsuccessful and thus repeats unsuccessful attempts even if receiving a notification indicating that the biometric authentication result is unsuccessful biometric authentication. Therefore, there is a problem that it takes time until biometric authentication is successfully completed, hence, high operational burden. - It is an object of the invention to provide a biometric authentication device that can suppress operational burden.
- According to an embodiment of the invention, a biometric authentication device comprises:
-
- a biometric information sensor to read biometric information of a user;
- a biometric information storage unit to pre-register biometric information of a. registered person as registered biometric information for verification;
- a determination unit to determine whether or not a captured image captured by the biometric information sensor is suitable for biometric authentication, and to perform biometric authentication by comparing the captured image to the registered biometric information registered in the biometric information storage unit when the determination unit determines that the captured image is suitable for the biometric authentication; and
- a notification unit to issue a notification indicating that the captured image is unsuitable for the biometric authentication,
- wherein, when the determination unit determines that the captured image is unsuitable for the biometric authentication, the determination unit does not perform the biometric authentication by the authentication unit and causes the notification unit to notify that the captured image is unsuitable for the biometric authentication.
- According to an embodiment of the invention, it is possible to provide a. biometric authentication device that suppresses operational burden.
-
FIG. 1A is an explanatory diagram illustrating the inside of a vehicle in which a start switch device in an embodiment is arranged. -
FIG. 1B is an explanatory diagram illustrating the start switch device in the embodiment. -
FIG. 2A is a block diagram illustrating the start switch device in the embodiment. - FIG, 2B is a block diagram illustrating the vehicle.
-
FIG. 3A is an explanatory diagram illustrating a captured image that is captured by a biometric information sensor of the start switch device in the embodiment. -
FIG. 3B is an explanatory diagram illustrating a message that is issued by the start switch device in the embodiment and displayed on a main monitor. - FIG, 4A is an explanatory diagram illustrating a captured image that a control unit of the start switch device in the embodiment determines unsuitable for biometric authentication.
-
FIG. 4B is an explanatory diagram illustrating a captured image that the control unit of the start switch device in a modification determines unsuitable for biometric authentication. -
FIG. 4C is an explanatory diagram illustrating a captured image that the control unit of the start switch device in a modification determines unsuitable for biometric authentication. -
FIG. 5 is a flowchart showing an operation of the start switch device in the embodiment. - (Summary of the Embodiment)
- A biometric authentication device in the embodiment has a determination unit that does not perform biometric authentication when determining that a captured image captured by a biometric information sensor provided to read biometric information of a user is unsuitable for biometric authentication, but instead outputs a notification signal to cause a notification unit to issue a notification indicating that the captured image is unsuitable for the biometric authentication.
- When the captured image is not suitable for biometric authentication, this biometric authentication device notifies of it before performing biometric authentication,
- Therefore, it is possible to find out and address a problem of the captured image at an early, stage, and it is thus possible to suppress operational burden, as compared to when the result of biometric authentication is notified.
- (Embodiment)
- (General Configuration of a Start Switch Device 1)
-
FIG. 1A is an explanatory diagram illustrating the inside of a vehicle in which a start switch device in the embodiment is arranged, andFIG. 1B is an explanatory diagram the start switch device in the embodiment. FIG, 2A is a block diagram illustrating the start switch device in the embodiment andFIG. 2B is a block diagram illustrating the vehicle.FIG. 3A is an explanatory diagram illustrating a captured image that is captured by a biometric information sensor of the start switch device in the embodiment andFIG. 3B is an explanatory diagram illustrating a message that is issued by the start switch device in the embodiment and displayed on a main monitor. - In each drawing of the embodiment described below, a scale ratio may be different from an actual ratio. In addition, in
FIGS. 2A and 2B , flows of main signals and information, etc., are indicated by arrows. - As shown in
FIG. 1A , the start switch device I as the biometric authentication device is arranged on, e.g., apanel 80 located in front of a. user sitting in a driver's seat and at the periphery of asteering wheel 84. afloor console 81 located between the driver's seat and the front passenger seat, or thesteering wheel 84, etc, Thisstart switch device 1 can instruct a vehicle control unit 89 of avehicle 8 to start, or to prepare to start, a drive system of thevehicle 8 by a push operation (ON operation), and instruct to stop the drive system by a next push operation (OFF operation). - Start-up of the drive system of the
vehicle 8 and the power state transition of thevehicle 8 are judged by, e.g., the vehicle control unit 89 based on an instruction signal S3 output from thestart switch device 1 and the operating conditions for a shifting device, etc. In this regard, the biometric information device is not limited to the start switch device I and can be mounted on a device that performs biometric authentication for login, unlock or payment. - The start switch device I has, e.g., a
control unit 5 as a determination unit that does not perform biometric authentication when determining that a capturedimage 22 captured by abiometric information sensor 2 provided to readbiometric information 23 of a user is unsuitable for biometric authentication, but instead outputs a notification signal S4 to cause a notification unit to issue a notification indicating that the capturedimage 22 is unsuitable for the biometric authentication, as shown inFIGS. 1B and 2A . - The
control unit 5 is configured to determine that the capturedimage 22 is unsuitable for the biometric authentication when the number of characteristic features 6 (described later) extracted from the capturedimage 22 is not more than anotification threshold value 52 as the first notification threshold value. - As shown in
FIGS. 1B and 2A , thestart switch device 1 is also provided with ebiometric information sensor 2 and aswitch unit 4, as an example. - As shown in
FIG. 1B , thisstart switch device 1 is provided with, e.g., a cylindricalmain body 10 and anoperation button 12. Theoperation button 12 is inserted into anopening 102 of themain body 10. - Meanwhile, as an example, the
vehicle 8 is provided with amain monitor 86, asub monitor 87 and the vehicle control unit 89, as shown inFIG. 2B . The notification unit in the present embodiment is at least one of themain monitor 86 and thesub monitor 87, but it is not limited thereto. In addition, the notification unit is not limited to, e.g., themain monitor 86 or thesub monitor 87 and may be a speaker device that output sound. In addition, the notification may be issued by, e.g., a combination of at least two of themain monitor 86, thesub monitor 87 and a speaker device. - As an example, the
main monitor 86 is arranged on acenter console 82 as shown in FIG. 1A, but it is not limited thereto. Themain monitor 86 is, e.g., a liquid crystal monitor and carries out display based on a display signal S5 output from the vehicle control unit 89. - As an example, the
sub monitor 87 is arranged on aninstrument panel 83 in front of the driver's seat as shown inFIG. 1A , but it is not limited thereto. The sub monitor 87 is, e.g., a liquid crystal monitor and carries out display based on a display signal S6 output from the vehicle control unit 89. The position for arranging thesub monitor 87 is not limited to, e.g., theinstrument panel 83 and may be another position such as a head-up display, etc. In the following description, the notification unit is themain monitor 86. - The vehicle control unit 89 is, e.g., a microcomputer composed of a CPU (Central Processing Unit), and a RAM (Random Access Memory) and a ROM (Read Only Memory) as semiconductor memories, etc. The vehicle control unit 89 is electromagnetically connected to the
start switch device 1 via, e.g., an in-vehicle LAN (Local Area Network) such as CAN (Controller Area Network) or LIN (Local Interconnect Network). - (Configuration of the Biometric Information Sensor 2)
- The
biometric information sensor 2 is configured to read, e.g., a fingerprint of an operating linger 9 as thebiometric information 23, as shown inFIGS. 1B and 3A . However, thebiometric information 23 is not limited to the fingerprint of theoperating finger 9 and may be a vein of theoperating finger 9, etc. - In case of reading, e.g., a fingerprint of the
operating finger 9, thebiometric information sensor 2 used here is a sensor of optical, capacitive, electric field strength measuring, pressure-sensitive, or thermal type, etc., which is configured to read a fingerprint. - Meanwhile, in case of reading, e.g., a vein of the
operating finger 9. thebiometric information sensor 2 used is a sensor configured to read a vein based on reflection of emitted infrared radiation. - Then, in case of reading, e.g., both a fingerprint and a vein, the
biometric information sensor 2 used is a sensor configured to extract a fingerprint and a vein by processing an image captured under visible light. - The
biometric information sensor 2 in the present embodiment is, e.g., a capacitive sensor that reads a fingerprint as thebiometric information 23. Thisbiometric information sensor 2 is configured to read thebiometric information 23 from theoperation finger 9 which is in contact with areading surface 20 when an operator touches anoperation surface 120 of theoperation button 12. - Alternatively, the reading
surface 20 may he arranged under theoperation surface 120 without being exposed on theoperation surface 120. In addition, the shape of the readingsurface 20 is not limited to, e.g., a rectangle and may be a circle or an ellipse. - The
biometric information sensor 2 is provided with, e.g., plural detection electrodes which are arranged in rows and columns in a grid pattern under the readingsurface 20. As an example, several ten thousand to several hundred thousand detection electrodes are formed and arranged at intervals of several pm to several tens pm. - The
biometric information sensor 2 is configured to scan all detection electrodes by, e.g., repeating a process of reading capacitances of the detection electrodes arranged in one row while changing columns and then subsequently reading capacitances of the detection electrodes arranged in a different row. The scanning cycle is about 100 ms, as an example. - The
biometric information sensor 2 outputs, e.g., capacitance information S1, which is generated based on plural capacitances read by scanning, to thecontrol unit 5. The capacitance information S1 is generated based on, e.g., capacitances in one cycle. - In particular, the
biometric information sensor 2 generates the capacitance information S1 by, e.g., classifying the capacitances into binary values in such a manner that capacitances of not less than a predetermined threshold value are assigned “1” and capacitances of less than the threshold value are assigned “0”, and then associating the capacitances with the positions of the detection electrodes. - The captured
image 22 shown inFIG. 3A is obtained based on the capacitance information S1 and is produced in such a manner that the positions of the detection electrodes assigned “1” described above are shown in black and the positions of the detection electrodes assigned “0” are shown in white, as an example. The circles in the drawing are added to show some of the characteristic features 6 (described later). - The high-capacitance positions are positions of ridges of the fingerprint which are close to the detection electrodes, hence, capacitance is high. Meanwhile, the low-capacitance positions are positions of valleys of the fingerprint which are far from the detection electrodes, hence, capacitance is low. Therefore, as an example, the captured
image 22 shown inFIG. 3A is obtained when the high-capacitance positions are shown in black and the low-capacitance positions are shown in white. The image shown in black in the capturedimage 22 is the readbiometric information 23. - (Configuration of the Switch Unit 4)
- As an example, the
switch unit 4 is configured as a rubber dome switch which comes into contact with an end portion of theoperation button 12 on the opposite side to theoperation surface 120. The rubber dome switch is provided with, e.g., a rubber dome which generates an elastic force and has a movable contact, and a switch substrate on which the rubber dome is arranged and which has a fixed contact facing the movable contact. - When the
operation button 12 is pushed into themain body 10 by a push operation, the movable contact is electrically conducted to the fixed contact due to deformation of the rubber dome and a switch signal S2, which indicates that the switch is turned on, is output to thecontrol unit 5. Thestart switch device 1 is configured that when, e.g., the push operation ends, theoperation button 12 returns to the initial position by an elastic force of the rubber dome. - (Configuration of the Control Unit 5)
- FIG, 4A is an explanatory diagram illustrating a captured image that the control unit of the start switch device in the embodiment determines unsuitable for biometric authentication, and
FIGS. 4B and 4C are explanatory diagrams illustrating captured images that the control unit of the start switch device in modifications determines unsuitable for biometric authentication.FIG. 4B is an explanatory diagram in which the capturedimage 22 as shown inFIG. 4A is shown in binary. - The
control unit 5 is, e.g., a microcomputer composed of a CPU performing calculation and processing, etc., of the acquired data according to a stored program, and a RAM and a ROM as semiconductor memories, etc. The ROM stores, e.g., a program for operation of thecontrol unit 5. The RAM is used as, e.g., a storage area for storing registeredbiometric information 50, an authentication threshold value 51, thenotification threshold value 52, and calculation results, etc. In addition, thecontrol unit 5 has, inside thereof, a means for generating a clock signal, and operates based on the clock signal. - The
control unit 5 performs, e.g., an extraction process on the capacitance information S1 and extracts the characteristic features 6. The extraction process is, e.g., a process of extracting fingerprint ridges, etc. - The
characteristic feature 6 is, e,g., a center point, a bifurcation point, an ending point or a delta, etc., as shown inFIG. 3A , but it is not limited thereto. The center point is a point at the center of the fingerprint. The bifurcation point is a point at which a fingerprint ridge bifurcates. The ending point is a point at which a ridge ends. The delta is a point at which ridges from three directions meet. - The registered
biometric information 50 is, e.g., information associating a registered person's name with a template. The registered person's name is, e.g., to identify a registered person who has registered the registeredbiometric information 50, and it is acquired from thevehicle 8. The template is composed of, e.g., thecharacteristic features 6 of thebiometric information 23 that is read by thebiometric information sensor 2. In this regard, the registeredbiometric information 50 is created for eachbiometric information 23 of the fingerprint registered by the user. - The
control unit 5 compares, e.g., thecharacteristic features 6 of the read registeredbiometric information 23 of the user to the template of the registeredbiometric information 50 and calculates a degree of similarity based on the positions of thecharacteristic features 6 and distances between thecharacteristic features 6, etc. Then, when the degree of similarity is not less than the authentication threshold value 51, thecontrol unit 5 outputs the instruction signal S3 upon determination that the user is the registered person, i.e., the biometric information is successfully authenticated. - The authentication threshold value 51 is defined that the degree of similarity of the subject of comparison such as the positions of the
characteristic features 6 and the distances between thecharacteristic features 6, etc., is 80%, as an example. In other words, when, e.g., the number of the subjects of comparison used for biometric authentication is eighty and when match is found for not less than sixty-four subjects of comparison, thecontrol unit 5 determines that the user is the registered. person. - The biometric authentication is not limited to being performed by the authentication method using the degree of similarity of the
characteristic features 6 and may be performed by an authentication method such as pattern matching. - The
notification threshold value 52 is a threshold for determining whether or not the capturedimage 22 is suitable for biometric authentication. The capturedimage 22 which can be used for biometric authentication means that, e.g., the capturedimage 22 has manycharacteristic features 6 and is thus good enough to be compared to the registeredbiometric information 50. As such, thenotification threshold value 52 is a threshold related to the number of the characteristic features 6. - When, e.g., the degree of similarity of the subjects of comparison based on the positions of the
characteristic features 6 and the distances between thecharacteristic features 6, etc., is not less than the authentication threshold value 51, thecontrol unit 5 determines that biometric authentication is successful, as described above. The calculation of the positions of thecharacteristic features 6 and the distances between thecharacteristic features 6, etc., places a heavier load on the CPU and takes longer time than when counting the number of the characteristic features 6. - When notified that, e.g., a result of biometric authentication based on the calculation of the positions of the
characteristic features 6 and the distances between thecharacteristic features 6, etc. . . . by thecontrol unit 5 is unsuccessful, the user needs to touch thebiometric information sensor 2 with his/her finger again. If, e.g., the user performs many biometric authentication attempts without knowing why biometric authentication is unsuccessful, it takes long time until biometric authentication is successfully completed, and operational burden also increases. - The captured
image 22, which is read in a state that, e.g., a foreign matter such as liquid is sticking to thereading surface 20 of thebiometric information sensor 2 or a. foreign matter is sticking to the finger of the user, is highly likely an image that has ablank area 25 and is unsuitable for biometric authentication. Then, if the number of thecharacteristic features 6 in the capturedimage 22 is, e.g., obviously small without calculating the positions and the distances, biometric authentication is highly likely to be unsuccessful. - Accordingly, the
control unit 5 is configured to count the number of thecharacteristic features 6 and determines, before performing biometric authentication, whether or not the capturedimage 22 is suitable for biometric authentication based on thenotification threshold value 52. - When, the number of the
characteristic features 6 is not more than thenotification threshold value 52, thecontrol unit 5 outputs the notification signal S4 to the vehicle control unit 89. Based on the input notification signal S4, the vehicle control unit 89 causes, e.g., amessage image 861, which indicates that the capturedimage 22 is unsuitable for the biometric authentication, to be displayed on adisplay screen 860 of themain monitor 86, as shown inFIG. 3B . - This
message image 861 is “The image is not usable for biometric authentication, wipe your finger, wipe the sensor.”, as an example, - Here, the
control unit 5 as a modification is configured to determine that the capturedimage 22 is unsuitable for biometric authentication when a difference between the number of first values and the number of second values in the capturedimage 22, which is shown in binary using the first value and the second value, is not less than the notification threshold value 52 (the second notification threshold value). - The first value and the second value are, e.g., “0” and “1” described earlier. Meanwhile, the
notification threshold value 52 in this modification is, e.g., a threshold related to the difference between “0”s and “1”s. For example,FIG. 4B shows a part of detection electrodes each of which is provided with a binary value of “0” or “1”. - When, e.g., a foreign matter is sticking to the finger or the
reading surface 20, theblank area 25 is formed in the capturedimage 22, as shown inFIG. 4A . If, e.g., the foreign matter is not conductive, theblank area 25 is filled with the values “0”, resulting in that there are more “0”s than “1”s. Meanwhile, when, e.g., a conductive foreign matter is sticking, theblank area 25 is filled with “1”s, - When, e.g., the difference between “0”s and “1”s is not less than the
notification threshold value 52 as shown inFIG. 4B , thecontrol unit 5 determines that the capturedimage 22 is unsuitable for biometric authentication. In this regard, taking into consideration also the deposition of the conductive foreign matter, the difference between “0”s and “1”s is an absolute value. - Here, the
control unit 5 may be configured to determine that capturedimage 22 is unsuitable for biometric authentication when, e.g,. “0”s and “1”s are not scattered, i.e., when it is not clear. In this case, it could be the deposition of foreign matters but could be malfunction of thebiometric information sensor 2. Therefore, thecontrol unit 5 may be configured to output the notification signal S4 for notifying that theinformation sensor 2 is malfunctioning when the similar determination is made plural times. - Meanwhile, the
control unit 5 as another modification is configured to determine that the capturedimage 22 is unsuitable for the biometric authentication when an area of an image of the readbiometric information 23 of the user is not more than the notification threshold value 52 (the third notification threshold value). This area is calculated as, e.g., the number of detection electrodes assigned “0” or “1”. - The
notification threshold value 52 in this modification is a threshold related to the area of thebiometric information 23. FIG, 4C shows animage 26 of thebiometric information 23 that has a small area, as an example. The area of theimage 26 of thebiometric information 23 is small also when, there is theblank area 25 as shown inFIG. 4A . When the area of the image of thebiometric information 23 is small in such a manner, the number of thecharacteristic features 6 to be obtained is small. - The
control unit 5 is configured to determine that the capturedimage 22 is unsuitable for biometric authentication when the area of thebiometric information 23 is not more than thenotification threshold value 52. - Further alternatively, the
control unit 5 may be configured to determine whether or not the capturedimage 22 is suitable for biometric authentication based on a combination of at least two of the condition related to the number of thecharacteristic features 6, the condition related to the difference between the binary values, and the condition related. to the area which are described above. - Next, an example of an operation of the
start switch device 1 in the present embodiment will be described along with the flowchart ofFIG. 5 . An operation to determine whether or not the capturedimage 22 is suitable for biometric authentication will be described below - (Operation)
- The
control unit 5 acquires the capturedimage 22 that is captured when the user touched theoperation button 12 of the start switch device 1 (Step 1), - Next, the
control unit 5 determines whether or not the acquired capturedimage 22 is suitable fix biometric authentication. The control unit S extracts thecharacteristic features 6 from the capturedimage 22 and determines that the capturedimage 22 is suitable for biometric authentication when the number of the extractedcharacteristic features 6 is more than the notification threshold value 52 (Step 2: Yes). - Next, the
control unit 5 starts biometric authentication based on its determination that the capturedimage 22 is suitable for biometric authentication (Step 3), and then ends the operation to determines whether or not the capturedimage 22 is suitable for biometric authentication. - Meanwhile, when the number of the
characteristic features 6 in the capturedimage 22 is not more than thenotification threshold value 52 inStep 2, thecontrol unit 5 determines that the capturedimage 22 is unsuitable for biometric authentication (Step 2: No) and outputs the notification signal S4 to notify that the capturedimage 22 is unsuitable for biometric authentication (Step 4). - Effects of the embodiment
- The
start switch device 1 in the present embodiment can suppress operational burden. In particular, when the capturedimage 22 is not suitable for biometric authentication, thestart switch device 1 notifies of it before performing biometric authentication, Therefore, the user can find out and address a problem of the capturedimage 22 at an early stage, time to successful biometric authentication is reduced and it is thus possible to suppress operational burden, as compared to when the result of biometric authentication is notified. - Before performing biometric authentication, the
start switch device 1 can make themain monitor 86, etc., to display themessage image 861 indicating that the capturedimage 22 is unsuitable for the biometric authentication, thereby notifying the user of the deposition of a foreign matter. etc. Therefore, as compared to when not issuing a notification, the user can easily take measures such as wiping the readingsurface 20 of thebiometric information sensor 2 or wiping the finger, and thus can be successfully biometrically authenticated at an early stage. - Although some embodiment and modifications of the invention have been described, these embodiment and modifications are merely examples and the invention according to claims is not to be limited thereto. These new embodiment and modifications may be implemented in various other forms, and various omissions, substitutions and changes, etc., can be made without departing from the gist of the invention. In addition, all combinations of the features described in these embodiment and modifications are not necessary to solve the problem of the invention. Further, these embodiment and modifications are included within the scope and gist of the invention and also within the invention described in the claims and the range of equivalency.
- 1 START SWITCH DEVICE
- 2 BIOMETRIC INFORMATION SENSOR
- 5 CONTROL UNIT
- 6 CHARACTERISTIC FEATURE
- 20 READING SURFACE
- 22 CAPTURED IMAGE
- 23 BIOMETRIC INFORMATION
- 50 REGISTERED BIOMETRIC INFORMATION
- 51 AUTHENTICATION THRESHOLD VALUE.
- 52 NOTIFICATION THRESHOLD VALUE
- 86 MAIN MONITOR
- 87 SUB MONITOR
- 860 DISPLAY SCREEN
- 861 MESSAGE IMAGE
Claims (10)
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JP2018-165270 | 2018-09-04 | ||
JPJP2018-165270 | 2018-09-04 | ||
PCT/JP2019/033783 WO2020050115A1 (en) | 2018-09-04 | 2019-08-28 | Biometric authentication device |
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US11461449B2 US11461449B2 (en) | 2022-10-04 |
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EP (1) | EP3848890A4 (en) |
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US20230227002A1 (en) * | 2022-01-14 | 2023-07-20 | Jairus Smith | Biometric Steering Wheel and Biometric Based Vehicle Safety System |
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US20230227002A1 (en) * | 2022-01-14 | 2023-07-20 | Jairus Smith | Biometric Steering Wheel and Biometric Based Vehicle Safety System |
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US11461449B2 (en) | 2022-10-04 |
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WO2020050115A1 (en) | 2020-03-12 |
JP2020038491A (en) | 2020-03-12 |
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